<template>
    <div>
         <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>


        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
        <el-table :data="rolelist" border strip>
            <!-- 展开列 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <el-row :class="['bdbottom',i1 === 0?'bdtop':'', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                        <!-- 渲染一级权限 -->
                        <el-col :span="5">
                            <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                            <i class="el-icon-caret-right"></i>
                        </el-col>
                        <!-- 渲染二级和三级权限 -->
                        <el-col :span="19">
                            <!-- 通过for循环嵌套二级权限 -->
                            <el-row :class="[i2 === 0?'':'bdtop', 'vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                <el-col :span="6">
                                     <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                     <i class="el-icon-caret-right"></i>
                                </el-col >
                                <el-col :span="18">
                                    <el-tag  type="warning" v-for="(item3,i3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">
                                        {{item3.authName}}
                                    </el-tag>
                                </el-col>
                            </el-row>
                        </el-col>
                    </el-row>
                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" >
                <template slot-scope="scope">
                    <el-button size="small " type="primary" icon="el-icon-edit">编辑</el-button>
                    <el-button size="small " type="danger" icon="el-icon-delete">删除</el-button>
                    <el-button size="small " type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                </template>
            </el-table-column>
        </el-table>
        </el-card>

        <!-- 分配权限对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="SetRightDialogVisible"
            width="50%"
            @close="SetRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightslist" :props="treeProps"  show-checkbox node-key='id' default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer" >
                <el-button @click="SetRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>

        
    </div>
</template>
<script>
export default {
    data(){
        return{
        // 所有角色列表数据
        rolelist:[],
        // 控制分配权限对话框的显示和隐藏
        SetRightDialogVisible: false,
        // 所有权限的数据
        rightslist:[],
        // 树形控件的属性绑定对象
        treeProps:{
            label:"authName",
            children:'children'
        },
        // 默认选中的节点id值
        defKeys:[],
        // 当前即将分配权限的角色id
        roleId:''
        }
    },
    created(){
        this.getRolesList()
    },
    methods:{
        async getRolesList(){
            const {data:res} = await this.$http.get('roles')
            
            if(res.meta.status != 200){
                return this.$message.error("获取角色列表失败！")

            }
            this.rolelist = res.data
            console.log(this.rolelist);
        },
        // 根据id删除对应的权限
        async removeRightById(role,rightId){
            // 弹框提示用户是否要删除
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
        }).catch(err => err)
        
        if(confirmResult != 'confirm'){
            return this.$message.info("取消了删除")
        }
        const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

        if(res.meta.status != 200){
            return this.$message.error('删除权限失败！')
        }
        // this.getRolesList()不建议重新渲染
        role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role){
            this.roleId = role.id
            // 获取所有权限的数据
            const {data:res} = await this.$http.get('rights/tree')
            this.SetRightDialogVisible = true
            
            if(res.meta.status != 200){
                return this.$mesage.error("获取quan'xi")
            }
            // 获取到的权限数据保存到data中
            this.rightslist = res.data
            // 递归获取三级节点的id
            this.getLeafKeys(role,this.defKeys)

            this.SetRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有三级权限的id，并保存到defKeys
        getLeafKeys(node,arr){
            // 如果node节点不包含不包含
            // children属性就是三级节点
            if(!node.children){
                return arr.push(node.id)
            }
            node.children.forEach(item =>{
                this.getLeafKeys(item,arr)
            })
        },
        // 监听分配权限对话框的关闭事件
        SetRightDialogClosed(){
            this.defKeys = []
        },
        // 为角色分配权限
        async allotRights(){
            const keys =[
            ...this.$refs.treeRef.getCheckedKeys(),
            ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            const idStr = keys.join(',')
            const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})

            if(res.meta.status != 200){
                return this.$message.error("分配权限失败！")
            }
            this.$message.success('分配权限成功！')
            this.getRolesList()
            this.SetRightDialogVisible = false
        }
    }
}
    
</script>
<style scoped>

.el-tag{
    margin: 7px;
}

.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}
.vcenter{
    display: flex;
    align-items: center;
}

</style>